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Two pipes, when working one at a time, c...

Two pipes, when working one at a time, can fill a cistern in 3 hours and 4 hours,respectively while a third pipe can drain the cistern empty in 8 hours. All the three pipes were opened together when the cistern was `1/12` full. How long did it take for the cistern to be completely full?

A

2 hours

B

1 hour 45 minutes

C

2 hour 11 minutes

D

2 hour 10 minutes

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